I just had a random thought about something that could be a contributing factor. Can you check the tangs of your drive links and feel if the leading edges are rounded or if they are still square? They look a bit rounded to me from the picture, but I can't be completely sure.
The reason why I think this could be a contributing factor is that if they are rounded, they are more likely to pack dust and chips into the side of the bar groove and cause the jam. If they are square, they are more likely to operate as they should and essentially scrape the dust and chips out from the sides (it will still pack it into the bottom of the groove). You should be able to sharpen these with your round file (I found this oregon pdf that shows pictures and gives a more in depth explanation:
https://www.oregonproducts.eu/fileadmin/user_upload/PDF/MM_EN.pdf go to page 55 of the pdf, or page 51 according to the numbering on the pages themselves)
Another thought is to check the groove depth. If there isn't enough space to allow for some grime to collect there, it will cause binding much more quickly.